package com.example.util;

import java.sql.Timestamp;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.Instant;
import java.time.LocalDate;
import java.time.ZoneId;
import java.time.temporal.ChronoUnit;
import java.util.*;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import static java.lang.System.err;

public class DateUtils {


    /**
     *
     * @param startDate 开始时间
     * @param endDate 结束时间
     * @return 计算两个日期相差年数
     */
    public static int yearDateDiff(String startDate,String endDate){
        Calendar calStartTime = Calendar.getInstance(); //获取日历实例
        Calendar calEndTime = Calendar.getInstance();
        calStartTime.setTime(strTodate(startDate)); //字符串按照指定格式转化为日期
        calEndTime.setTime(strTodate(endDate));
        return calEndTime .get(Calendar.YEAR) - calStartTime .get(Calendar.YEAR);
    }


    /**
     *
     * @param dateStr 需要转换的日期
     * @return 字符串按照指定格式转化为日期
     */
    public static Date strTodate(String dateStr) {
        // 如果时间为空则默认当前时间
        Date date = null;
        SimpleDateFormat format = new SimpleDateFormat("yyyy-mm-dd");
        if (dateStr != null && !dateStr.equals("")) {
            String time = "";
            try {
                Date dateTwo = format.parse(dateStr);
                time = format.format(dateTwo);
                date = format.parse(time);
            } catch (ParseException e) {
                e.printStackTrace();
            }

        } else {
            String timeTwo = format.format(new Date());
            try {
                date = format.parse(timeTwo);
            } catch (ParseException e) {
                e.printStackTrace();
            }
        }
        return date;
    }

    /**
     * @param localDate 出生日期
     * @return 年龄
     * @throws ParseException
     */
    public static int getAgeByBirth(LocalDate localDate) throws ParseException {
        ZoneId zone = ZoneId.systemDefault();
        Instant instant = localDate.atStartOfDay().atZone(zone).toInstant();
        java.util.Date birthDay = Date.from(instant);
        int age = 0;
        Calendar cal = Calendar.getInstance();
        if (cal.before(birthDay)) { //出生日期晚于当前时间，无法计算
            throw new IllegalArgumentException(
                    "The birthDay is before Now.It's unbelievable!");
        }
        int yearNow = cal.get(Calendar.YEAR);  //当前年份
        int monthNow = cal.get(Calendar.MONTH);  //当前月份
        int dayOfMonthNow = cal.get(Calendar.DAY_OF_MONTH); //当前日期
        cal.setTime(birthDay);
        int yearBirth = cal.get(Calendar.YEAR);
        int monthBirth = cal.get(Calendar.MONTH);
        int dayOfMonthBirth = cal.get(Calendar.DAY_OF_MONTH);
        age = yearNow - yearBirth;   //计算整岁数
        if (monthNow <= monthBirth) {
            if (monthNow == monthBirth) {
                if (dayOfMonthNow < dayOfMonthBirth) age--;//当前日期在生日之前，年龄减一
            } else {
                age--;//当前月份在生日之前，年龄减一
            }
        }
        return age;
    }

    /**
     * 当前时间 与 面试时间比较
     * @param startDateTime string 面试时间
     * @return 大于 >0
     */
    public static Integer getCompareTime(String startDateTime){
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date currentTime = new Date();
        // 追加 10分钟
        Date date = new Date(currentTime.getTime() + 600000);
        String d1Str = df.format(date);
        return d1Str.compareTo(startDateTime);
    }

    /**
     * 比较日期
     * @param startDate 合同结束时间
     */
    public static Integer getCompareDate(String startDate) throws ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat( "yyyy-MM-dd" );
        Date date = new Date();
        Date parse = sdf.parse(startDate);
        int days = DateUtils.getDiffDays(date, parse);
        err.println("days --> " + days);
        return days;
    }

    /**
     * 根据 日期范围 迭代出需要 打卡的日期
     * @param timeStart 开始日期
     * @param timeEnd 结束日期
     */
    public  static List<String>  getTimeRangeDay(Date timeStart,Date timeEnd){
        LocalDate start = timeStart.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
        LocalDate end = timeEnd.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
        List<String> list = Stream.iterate(start, localDate -> localDate.plusDays(1))
                .limit(ChronoUnit.DAYS.between(start, end) + 1)
                .map(LocalDate::toString)
                .collect(Collectors.toList());

        list.forEach(System.out::println);

        return list;
    }

    // 获取当天的开始时间
    public static java.util.Date getDayBegin() {
        Calendar cal = new GregorianCalendar();
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);
        return cal.getTime();
    }

    // 获取当天的结束时间
    public static java.util.Date getDayEnd() {
        Calendar cal = new GregorianCalendar();
        cal.set(Calendar.HOUR_OF_DAY, 23);
        cal.set(Calendar.MINUTE, 59);
        cal.set(Calendar.SECOND, 59);
        return cal.getTime();
    }

    // 获取昨天的开始时间
    public static Date getBeginDayOfYesterday() {
        Calendar cal = new GregorianCalendar();
        cal.setTime(getDayBegin());
        cal.add(Calendar.DAY_OF_MONTH, -1);
        return cal.getTime();
    }

    // 获取昨天的结束时间
    public static Date getEndDayOfYesterDay() {
        Calendar cal = new GregorianCalendar();
        cal.setTime(getDayEnd());
        cal.add(Calendar.DAY_OF_MONTH, -1);
        return cal.getTime();
    }

    // 获取明天的开始时间
    public static Date getBeginDayOfTomorrow() {
        Calendar cal = new GregorianCalendar();
        cal.setTime(getDayBegin());
        cal.add(Calendar.DAY_OF_MONTH, 1);
        return cal.getTime();
    }

    // 获取明天的结束时间
    public static Date getEndDayOfTomorrow() {
        Calendar cal = new GregorianCalendar();
        cal.setTime(getDayEnd());
        cal.add(Calendar.DAY_OF_MONTH, 1);
        return cal.getTime();
    }

    // 获取本周的开始时间
    public static Date getBeginDayOfWeek() {
        Date date = new Date();
        if (date == null) {
            return null;
        }
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        int dayofweek = cal.get(Calendar.DAY_OF_WEEK);
        if (dayofweek == 1) {
            dayofweek += 7;
        }
        cal.add(Calendar.DATE, 2 - dayofweek);
        return getDayStartTime(cal.getTime());
    }

    // 获取本周的结束时间
    public static Date getEndDayOfWeek() {
        Calendar cal = Calendar.getInstance();
        cal.setTime(getBeginDayOfWeek());
        cal.add(Calendar.DAY_OF_WEEK, 6);
        Date weekEndSta = cal.getTime();
        return getDayEndTime(weekEndSta);
    }

    // 获取本月的开始时间
    public static Date getBeginDayOfMonth() {
        Calendar calendar = Calendar.getInstance();
        calendar.set(getNowYear(), getNowMonth() - 1, 1);
        return getDayStartTime(calendar.getTime());
    }

    // 获取本月的结束时间
    public static Date getEndDayOfMonth() {
        Calendar calendar = Calendar.getInstance();
        calendar.set(getNowYear(), getNowMonth() - 1, 1);
        int day = calendar.getActualMaximum(5);
        calendar.set(getNowYear(), getNowMonth() - 1, day);
        return getDayEndTime(calendar.getTime());
    }

    // 获取上个月的开始时间
    public static Date getBeginDayOfLastMonth() {
        Date date = new Date();
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(calendar.MONTH, -1);
        calendar.set(calendar.DAY_OF_MONTH, 1);
        return getDayStartTime(calendar.getTime());
    }

    // 获取上个月的结束时间
    public static Date getEndDayOfLastMonth() {
        Date date = new Date();
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(calendar.MONTH, -1);
        int day = calendar.getActualMaximum(5);
        calendar.set(calendar.DAY_OF_MONTH, day);
        return getDayEndTime(calendar.getTime());
    }

    // 获取本年的开始时间
    public static java.util.Date getBeginDayOfYear() {
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, getNowYear());
        // cal.set
        cal.set(Calendar.MONTH, Calendar.JANUARY);
        cal.set(Calendar.DATE, 1);

        return getDayStartTime(cal.getTime());
    }

    // 获取本年的结束时间
    public static java.util.Date getEndDayOfYear() {
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, getNowYear());
        cal.set(Calendar.MONTH, Calendar.DECEMBER);
        cal.set(Calendar.DATE, 31);
        return getDayEndTime(cal.getTime());
    }

    // 获取某个日期的开始时间
    public static Timestamp getDayStartTime(Date d) {
        Calendar calendar = Calendar.getInstance();
        if (null != d)
            calendar.setTime(d);
        calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH), 0,
            0, 0);
        calendar.set(Calendar.MILLISECOND, 0);
        return new Timestamp(calendar.getTimeInMillis());
    }

    // 获取某个日期的结束时间
    public static Timestamp getDayEndTime(Date d) {
        Calendar calendar = Calendar.getInstance();
        if (null != d)
            calendar.setTime(d);
        calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH), 23,
            59, 59);
        calendar.set(Calendar.MILLISECOND, 999);
        return new Timestamp(calendar.getTimeInMillis());
    }

    // 获取今年是哪一年
    public static Integer getNowYear() {
        Date date = new Date();
        GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();
        gc.setTime(date);
        return Integer.valueOf(gc.get(1));
    }

    // 获取本月是哪一月
    public static int getNowMonth() {
        Date date = new Date();
        GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();
        gc.setTime(date);
        return gc.get(2) + 1;
    }

    // 两个日期相减得到的天数
    public static int getDiffDays(Date beginDate, Date endDate) {

        if (beginDate == null || endDate == null) {
            throw new IllegalArgumentException("getDiffDays param is null!");
        }

        long diff = (endDate.getTime() - beginDate.getTime()) / (1000 * 60 * 60 * 24);

        int days = new Long(diff).intValue();

        return days;
    }

    // 两个日期相减得到的毫秒数
    public static long dateDiff(Date beginDate, Date endDate) {
        long date1ms = beginDate.getTime();
        long date2ms = endDate.getTime();
        return date2ms - date1ms;
        }

    // 获取两个日期中的最大日期
    public static Date max(Date beginDate, Date endDate) {
        if (beginDate == null) {
            return endDate;
        }
        if (endDate == null) {
            return beginDate;
        }
        if (beginDate.after(endDate)) {
            return beginDate;
        }
        return endDate;
    }

    // 获取两个日期中的最小日期
    public static Date min(Date beginDate, Date endDate) {
        if (beginDate == null) {
            return endDate;
        }
        if (endDate == null) {
            return beginDate;
        }
        if (beginDate.after(endDate)) {
            return endDate;
        }
        return beginDate;
    }

    // 返回某月该季度的第一个月
    public static Date getFirstSeasonDate(Date date) {
        final int[] SEASON = { 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4 };
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        int sean = SEASON[cal.get(Calendar.MONTH)];
        cal.set(Calendar.MONTH, sean * 3 - 3);
        return cal.getTime();
    }

    // 返回某个日期下几天的日期
    public static Date getNextDay(Date date, int i) {
        Calendar cal = new GregorianCalendar();
        cal.setTime(date);
        cal.set(Calendar.DATE, cal.get(Calendar.DATE) + i);
        return cal.getTime();
    }

    // 返回某个日期前几天的日期
    public static Date getFrontDay(Date date, int i) {
        Calendar cal = new GregorianCalendar();
        cal.setTime(date);
        cal.set(Calendar.DATE, cal.get(Calendar.DATE) - i);
        return cal.getTime();
    }

    // 获取某年某月到某年某月按天的切片日期集合（间隔天数的日期集合）
    public static List getTimeList(int beginYear, int beginMonth, int endYear, int endMonth, int k) {
        List list = new ArrayList();
        if (beginYear == endYear) {
            for (int j = beginMonth; j <= endMonth; j++) {
            list.add(getTimeList(beginYear, j, k));

            }
        } else {
            {
            for (int j = beginMonth; j < 12; j++) {
                list.add(getTimeList(beginYear, j, k));
            }

            for (int i = beginYear + 1; i < endYear; i++) {
                for (int j = 0; j < 12; j++) {
                list.add(getTimeList(i, j, k));
                }
            }
            for (int j = 0; j <= endMonth; j++) {
                list.add(getTimeList(endYear, j, k));
            }
            }
        }
        return list;
    }

    // 获取某年某月按天切片日期集合（某个月间隔多少天的日期集合）
    public static List getTimeList(int beginYear, int beginMonth, int k) {
        List list = new ArrayList();
        Calendar begincal = new GregorianCalendar(beginYear, beginMonth, 1);
        int max = begincal.getActualMaximum(Calendar.DATE);
        for (int i = 1; i < max; i = i + k) {
            list.add(begincal.getTime());
            begincal.add(Calendar.DATE, k);
        }
        begincal = new GregorianCalendar(beginYear, beginMonth, max);
        list.add(begincal.getTime());
        return list;
    }

    // 获取某年某月的第一天日期
    public static Date getStartMonthDate(int year, int month) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(year, month - 1, 1);
        return calendar.getTime();
    }

    // 获取某年某月的最后一天日期
    public static Date getEndMonthDate(int year, int month) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(year, month - 1, 1);
        int day = calendar.getActualMaximum(5);
        calendar.set(year, month - 1, day);
        return calendar.getTime();
    }
}
